Range on any given day is the result of several factors working together, not just the battery size printed on the spec sheet. Here’s what actually moves the needle, roughly in order of how much impact each one tends to have.
The biggest factors
- Speed. Aerodynamic drag increases sharply at higher speeds, so highway driving at 75 mph uses noticeably more energy per mile than city driving at 35 mph, often the single biggest factor in day-to-day range variation.
- Temperature. Cold weather reduces range both by making the battery itself less efficient and by requiring extra energy for cabin heating. Hot weather has a smaller effect, mainly from air conditioning use.
- Terrain. Sustained uphill driving uses considerably more energy than flat terrain, though downhill stretches partially return some of that energy through regenerative braking.
- Driving style. Aggressive acceleration and hard braking waste energy compared to smoother, more gradual inputs, similar to how aggressive driving hurts gas mileage in a conventional car.
- Cargo and passenger weight. More weight requires more energy to move, though this effect is generally smaller than speed or temperature for typical loads.
- Tire pressure and type. Underinflated tires increase rolling resistance; low-rolling-resistance tires are specifically designed to minimize this effect.
Why this matters more for EVs than gas cars
Gas cars experience similar effects, highway driving hurts MPG too, but the percentage swing tends to be more noticeable in an EV, partly because there’s no separate “heater” powered by waste engine heat, cabin heating draws directly from the same battery powering the drivetrain. This is part of why cold weather in particular gets discussed so much in EV range conversations.
What you can actually control
Of the factors above, driving style, tire pressure, and route choice (avoiding unnecessary highway miles when a similar-time alternate route exists) are the ones most within your control day to day. Speed and temperature matter more, but are largely dictated by circumstances rather than choice.
💡 Tip: Our Range Calculator lets you adjust for these factors directly to see how your real-world range compares to the rated spec sheet number.